A friend of mine got this card. The highest he's gotten it to was 290GPU and 620MEM. I think it could go higher, but he doesn't have good, heck fair, case cooling. Even though he says it's cool to the touch. My ti4200 128MB is at 300/590 and climbing. Turned my case fans down to 7w and started to see artifacts in 3dmarks. Once the fans were backup, no more artifacts. I'll try 600Mhz next week. Once I get to a halt I'm adding ramsinks.
Back to the card in question, I just read a review about this card.
Link Notice that the GPU doesn't go to high. I got mine to 310 but had problems in certains games and had to clock back down to 300 for stability. If you do get the turbo, get 4 more heatsinks for the back of the ram.
Link.
Good Luck!
-JC